Rural Retreat Depot is open today

[NW Mailing List]

There I was checking my email, blissfully unaware there is a revised
edition I now 'need'.   Thanks, Bud!  😉
[image: image.png]
Anyone know where to find a copy?

Thanks!
Mike Rector


On Sat, Oct 15, 2022 at 11:31 AM NW Mailing List <nw-mailing-list at nwhs.org>
wrote:

> Gordon,
>
>
>
> Dave explained this in detail. I covered this on page 247 in the Giant
> book revised edition. With this change, the rod between #3 and #4 wheels
> were the same as the front single rods. Louis Newton was the one I got this
> information from and only four J’s were changed. They were change only if
> stress fractures appeared on #4 four crank pins.
>
>
>
> Bud Jeffries
>
>
>
> *From:* NW-Mailing-List <nw-mailing-list-bounces at nwhs.org> *On Behalf Of *NW
> Mailing List via NW-Mailing-List
> *Sent:* Saturday, October 15, 2022 6:19 AM
> *To:* NW Mailing List <nw-mailing-list at nwhs.org>
> *Cc:* NW Mailing List <nw-mailing-list at nwhs.org>
> *Subject:* Re: Rural Retreat Depot is open today
>
>
>
> Initially, all modern 4-8-4's in the 1940 era that were equipped with
> roller bearing rods using the so-called tandem rod connection between #2
> and #3 axles. In addition, because of this configuration, all of them had
> relatively long crankpins on #4 axle.  Because all railroads used the same
> method (tandem rods), this was likely the industry standard for handling
> the forces that had to be distributed through the running gear,
> particularly between axles #2 and #3 of a 4-axle engine set.
>
> N&W revised the Class J rods to do away with the tandem rod setup between
> #2 and #3 driving axle on four locomotives  from about 1952 to 1956.  From
> a side view, the change can be seen in a much larger rod hub on #3 axle,
> because one rod bearing must carry the same load that two smaller bearings
> carried before.  Also the hub on #4 axle is much shorter (the rod is closer
> to the driver face) which reduced the stresses that were present in the
> longer crankpin
>
>
>
> Dave Stephenson
>
>
>
>
>
>
>
> On Friday, October 14, 2022 at 10:41:35 PM EDT, NW Mailing List <
> nw-mailing-list at nwhs.org> wrote:
>
>
>
>
>
> Dave,
>
> Pardon my ignorance, but what is the modification of rods on these four Js?
>
> Gordon Hamilton
>
>
>
>
>
> On 10/14/2022 10:29 AM, NW Mailing List via NW-Mailing-List wrote:
>
> The four J's that I have for modified rods were 600, 605, 610, 611.  So
> with your photo, we've narrowed that to two.  Really does look like 611 in
> the negative enlargement, but the top part of the second "1" does look a
> little different  from the top part of the first "1"............  Thanks
> for posting!!
>
>
>
> Dave Stephenson
>
>
>
>
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